Potential DLL Sideloading Of Non-Existent DLLs From System Folders
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About the rule
Rule Type
Standard
Rule Description
Detects DLL sideloading of system DLLs that are not present on the system by default (at least not in system directories). Usually this technique is used to achieve UAC bypass or privilege escalation.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "sa_imageloaded" AND OBJECTNAME endswith ":\Windows\System32\TSMSISrv.dll,:\Windows\System32\TSVIPSrv.dll,:\Windows\System32\wbem\wbemcomn.dll,:\Windows\System32\WLBSCTRL.dll,:\Windows\System32\wow64log.dll,:\Windows\System32\WptsExtensions.dll" AND (SIGNED != "true" OR SIGNATURESTATUS != "Valid" OR SIGNATURE != "Microsoft Windows") select Action1.HOSTNAME,Action1.MESSAGE,Action1.PROCESSNAME,Action1.PRODUCT_NAME,Action1.OBJECTNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems), SBousseaden
